pub trait ImmutableTuple4<A, B, C, D> {
fn n0_ref<'a>(&'a self) -> &'a A;
fn n1_ref<'a>(&'a self) -> &'a B;
fn n2_ref<'a>(&'a self) -> &'a C;
fn n3_ref<'a>(&'a self) -> &'a D;
}
fn n0_ref<'a>(&'a self) -> &'a Afn n1_ref<'a>(&'a self) -> &'a Bfn n2_ref<'a>(&'a self) -> &'a Cfn n3_ref<'a>(&'a self) -> &'a Dimpl<A, B, C, D> ImmutableTuple4<A, B, C, D> for (A, B, C, D)
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